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// Copyright 2012 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "includes_normalize.h"
#include "string_piece.h"
#include "string_piece_util.h"
#include "util.h"
#include <algorithm>
#include <iterator>
#include <sstream>
#include <windows.h>
namespace {
bool InternalGetFullPathName(const StringPiece& file_name, char* buffer,
size_t buffer_length, string *err) {
DWORD result_size = GetFullPathNameA(file_name.AsString().c_str(),
buffer_length, buffer, NULL);
if (result_size == 0) {
*err = "GetFullPathNameA(" + file_name.AsString() + "): " +
GetLastErrorString();
return false;
} else if (result_size > buffer_length) {
*err = "path too long";
return false;
}
return true;
}
bool IsPathSeparator(char c) {
return c == '/' || c == '\\';
}
// Return true if paths a and b are on the same windows drive.
// Return false if this funcation cannot check
// whether or not on the same windows drive.
bool SameDriveFast(StringPiece a, StringPiece b) {
if (a.size() < 3 || b.size() < 3) {
return false;
}
if (!islatinalpha(a[0]) || !islatinalpha(b[0])) {
return false;
}
if (ToLowerASCII(a[0]) != ToLowerASCII(b[0])) {
return false;
}
if (a[1] != ':' || b[1] != ':') {
return false;
}
return IsPathSeparator(a[2]) && IsPathSeparator(b[2]);
}
// Return true if paths a and b are on the same Windows drive.
bool SameDrive(StringPiece a, StringPiece b, string* err) {
if (SameDriveFast(a, b)) {
return true;
}
char a_absolute[_MAX_PATH];
char b_absolute[_MAX_PATH];
if (!InternalGetFullPathName(a, a_absolute, sizeof(a_absolute), err)) {
return false;
}
if (!InternalGetFullPathName(b, b_absolute, sizeof(b_absolute), err)) {
return false;
}
char a_drive[_MAX_DIR];
char b_drive[_MAX_DIR];
_splitpath(a_absolute, a_drive, NULL, NULL, NULL);
_splitpath(b_absolute, b_drive, NULL, NULL, NULL);
return _stricmp(a_drive, b_drive) == 0;
}
// Check path |s| is FullPath style returned by GetFullPathName.
// This ignores difference of path separator.
// This is used not to call very slow GetFullPathName API.
bool IsFullPathName(StringPiece s) {
if (s.size() < 3 ||
!islatinalpha(s[0]) ||
s[1] != ':' ||
!IsPathSeparator(s[2])) {
return false;
}
// Check "." or ".." is contained in path.
for (size_t i = 2; i < s.size(); ++i) {
if (!IsPathSeparator(s[i])) {
continue;
}
// Check ".".
if (i + 1 < s.size() && s[i+1] == '.' &&
(i + 2 >= s.size() || IsPathSeparator(s[i+2]))) {
return false;
}
// Check "..".
if (i + 2 < s.size() && s[i+1] == '.' && s[i+2] == '.' &&
(i + 3 >= s.size() || IsPathSeparator(s[i+3]))) {
return false;
}
}
return true;
}
} // anonymous namespace
IncludesNormalize::IncludesNormalize(const string& relative_to) {
string err;
relative_to_ = AbsPath(relative_to, &err);
if (!err.empty()) {
Fatal("Initializing IncludesNormalize(): %s", err.c_str());
}
split_relative_to_ = SplitStringPiece(relative_to_, '/');
}
string IncludesNormalize::AbsPath(StringPiece s, string* err) {
if (IsFullPathName(s)) {
string result = s.AsString();
for (size_t i = 0; i < result.size(); ++i) {
if (result[i] == '\\') {
result[i] = '/';
}
}
return result;
}
char result[_MAX_PATH];
if (!InternalGetFullPathName(s, result, sizeof(result), err)) {
return "";
}
for (char* c = result; *c; ++c)
if (*c == '\\')
*c = '/';
return result;
}
string IncludesNormalize::Relativize(
StringPiece path, const vector<StringPiece>& start_list, string* err) {
string abs_path = AbsPath(path, err);
if (!err->empty())
return "";
vector<StringPiece> path_list = SplitStringPiece(abs_path, '/');
int i;
for (i = 0; i < static_cast<int>(min(start_list.size(), path_list.size()));
++i) {
if (!EqualsCaseInsensitiveASCII(start_list[i], path_list[i])) {
break;
}
}
vector<StringPiece> rel_list;
rel_list.reserve(start_list.size() - i + path_list.size() - i);
for (int j = 0; j < static_cast<int>(start_list.size() - i); ++j)
rel_list.push_back("..");
for (int j = i; j < static_cast<int>(path_list.size()); ++j)
rel_list.push_back(path_list[j]);
if (rel_list.size() == 0)
return ".";
return JoinStringPiece(rel_list, '/');
}
bool IncludesNormalize::Normalize(const string& input,
string* result, string* err) const {
char copy[_MAX_PATH + 1];
size_t len = input.size();
if (len > _MAX_PATH) {
*err = "path too long";
return false;
}
strncpy(copy, input.c_str(), input.size() + 1);
uint64_t slash_bits;
if (!CanonicalizePath(copy, &len, &slash_bits, err))
return false;
StringPiece partially_fixed(copy, len);
string abs_input = AbsPath(partially_fixed, err);
if (!err->empty())
return false;
if (!SameDrive(abs_input, relative_to_, err)) {
if (!err->empty())
return false;
*result = partially_fixed.AsString();
return true;
}
*result = Relativize(abs_input, split_relative_to_, err);
if (!err->empty())
return false;
return true;
}
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